My dog Ruff Ruff
When I was about 4 years old and my brother was 2, I used to tie a string around his waist (we weren't allowed to tie stuff around our necks - mom's rule) and walk around the house with him - especially when my parents were entertaining. He would crawl on his hands and knees and bark like a dog. The adults thought this was kind of cute. When one of them would acknowledge us ("Oh, aren't you cute!") I would say, "This is my dog Ruff Ruff." Polite smiles. "He bites." Squeals of pain as "Ruff Ruff" dug his teeth into their ankles.
After a few parties like this we were given a new rule. Bite the guests, lose our teeth. heh heh. Fun while it lasted.